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Positive electrode material, preparation method thereof and secondary lithium battery

A technology of positive electrode materials and elements, applied in the field of high-nickel ternary positive electrode materials and its preparation, can solve the problems of increasing the complexity of the precursor preparation process, high requirements for process stability control, increasing mixing and heat treatment, and achieving safe large-scale Industrialized production, improving the stability of material structure, and inhibiting the effect of material phase transition

Active Publication Date: 2021-08-13
SHENZHEN CITY BATTERY NANOMETER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional coating modification not only needs to increase the cost of coating auxiliary materials, but also needs to increase the mixing and heat treatment process, which increases the complexity of the process, making the process stability control requirements higher and the processing cost higher
Doping modification can be carried out in two processes of precursor preparation and lithium mixed sintering. The biggest problem of doping in the precursor preparation process is to increase the process complexity of precursor preparation

Method used

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  • Positive electrode material, preparation method thereof and secondary lithium battery
  • Positive electrode material, preparation method thereof and secondary lithium battery
  • Positive electrode material, preparation method thereof and secondary lithium battery

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preparation example Construction

[0084] In the second aspect, the embodiment of the present application also provides a method for preparing a positive electrode material, such as figure 1 As shown, the following steps S100-S200 are included:

[0085] Step S100, will contain Ni 1-x-y co x al y The mixture of oxide and / or hydroxide, M compound and lithium compound is sintered to obtain a fired product; wherein, 0≤x≤0.15, 0.01≤y≤0.1, and the M element is a metal element;

[0086] Step S200, washing and drying the calcined product with a solvent to obtain the positive electrode material, the general chemical formula of the positive electrode material is Li b Ni 1-x-y co x al y m z o 2 , wherein, 0.95≤b≤1.10, 0≤x≤0.15, 0.01≤y≤0.1, 0<z≤0.05, the M element is distributed in the interior and surface layer of the positive electrode material, and the M element distributed in the positive electrode material The M element exists in the form of doping, and the M element distributed on the surface of the positive...

Embodiment 1

[0120] In this embodiment, the positive electrode material is prepared according to the following method:

[0121] (1) First, the Ni 0.88 co 0.09 Al 0.03 o 2 Oxide, lithium hydroxide and Mg(OH) with a D50 of 2.5 μm 2 Mix evenly in a high-mixer (Li / (Ni+Co+Al+Mg)=1.08, Mg is 3000ppm), and finally sinter the above mixture at 760°C in an atmosphere of 95% oxygen+5% nitrogen for 10 hours, and then pulverize Sieve to obtain Mg-modified calcined Li 1.08 Ni 0.88 co 0.09 Al 0.03 Mg 0.013 o 2 .

[0122] (2) The above-mentioned fired material Li 1.08 Ni 0.88 co 0.09 Al 0.03 Mg 0.013 o 2 with containing 1.5wt% H 3 PO 4 The aqueous solution according to the slurry concentration of 1000g / L (fired product (g) / H 3 PO 4 Aqueous solution (L)) is mixed into a slurry, then washed, filtered, and dried to obtain the positive electrode material LiNi 0.88 co 0.09 Al 0.03 Mg 0.013 o 2 , its average particle size is 12.5μm, D95 is 21.3μm, specific surface area is 1.13m 2 / g

...

Embodiment 2

[0125] In this embodiment, the positive electrode material is prepared according to the following method:

[0126] (1) First, the Ni 0.76 co 0.15 Al 0.09 (OH) 2 Calcined hydroxide, lithium hydroxide and Mg(OH) with a D50 of 2.5 μm 2 Mix evenly in a high-mixer (Li / (Ni+Co+Al+Mg)=1.10, Mg is 1000ppm), and finally sinter the above mixture at 850°C in an atmosphere of 90% oxygen+10% nitrogen for 26 hours, and then pulverize Sieve to obtain Mg-modified calcined Li 1.10 Ni 0.76 co 0.15 Al 0.09 Mg 0.004 o 2 .

[0127] (2) The above-mentioned fired material Li 1.10 Ni 0.76 co 0.15 Al 0.09 Mg 0.004 o 2 with containing 1.0wt% H 3 PO 4 The aqueous solution according to the slurry concentration of 500g / L (fired product (g) / H 3 PO 4 Aqueous solution (L)) is mixed into a slurry, then washed, filtered, and dried to obtain the positive electrode material LiNi 0.76 co 0.15 Al 0.09 Mg 0.004 o 2 , its average particle size is 15.3μm, D95 is 24.6μm, specific surface area i...

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Abstract

The invention provides a positive electrode material, a preparation method thereof and a secondary lithium battery. The positive electrode material is characterized in that the chemical general formula of the positive electrode material is LibNi1-x-yCoxAlyMzO2, b is more than or equal to 0.95 and less than or equal to 1.10, x is more than or equal to 0 and less than or equal to 0.15, y is more than or equal to 0.01 and less than or equal to 0.1, z is more than 0 and less than or equal to 0.05, and the element M is a metal element; M elements are distributed inside and on the surface layer of the positive electrode material, the M elements distributed inside the positive electrode material exist in a doping form, and the M elements distributed on the surface layer of the positive electrode material exist in a coating layer form formed by M oxide and / or lithium M composite oxide; and the molar ratio of the internal M element to the surface layer M element is greater than 0.5. The positive electrode material provided by the invention has good high rate capability and thermal stability.

Description

[0001] The present invention claims the priority of the Chinese patent application submitted to the China Patent Office on March 27, 2020, with the application number 2020102290983, and the title of the invention is "cathode material and its preparation method and secondary lithium battery", the entire content of which is incorporated by reference in this application. technical field [0002] The application relates to the field of secondary lithium batteries, in particular to positive electrode materials and preparation methods thereof, and secondary lithium batteries, especially to high-nickel ternary positive electrode materials, preparation methods thereof, and secondary lithium batteries. Background technique [0003] Environmental pollution and energy crisis have become two major problems in the development of the world today. It is imminent to solve the excessive consumption of traditional fossil energy and the environmental problems caused by it. The development and u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/052
CPCH01M4/366H01M4/485H01M4/525H01M4/62H01M4/628H01M4/624H01M10/052Y02E60/10H01M2004/028H01M4/1391C01P2004/03C01P2004/84C01P2002/88C01G53/42C01P2006/12C01G53/66C01P2006/40C01P2004/51C01P2004/61C01P2006/80C01P2002/54C01P2002/52C01G53/50H01M10/0525
Inventor 黄友元杨顺毅宋雄张弘旭罗亮野村峻守田昂輝四宫拓也
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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